Iptables can't find table 'filter'

Question

I'm trying to use a pogoplug pro running archlinux as a ppptp server.  I was following this tutorial
https://wiki.archlinux.org/index.php/PPTP_Server
and everything worked fine until i got to the part about configuring iptables.
Whenever I try any command against iptables i get the following error:
FATAL: Module ip_tables not found.
iptables v1.4.12.1: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
I did some reading and it appears that the kernel I am using does not have the module iptables needs to operate.
Can anyone please help?

Answer 1

So i decided to start from scratch and I got the latest tar ball of linux for the pogo plug pro from here:
http://archlinuxarm.org/os/ArchLinuxARM … est.tar.gz
and noticed that some things are different than when i used the script to install it. It appears there are modules for two kernels; is there a way I can switch to the 2.6.38 kernel so i can use all its modules?
uname -r:
2.6.31.6_SMP_820
/lib/modules/*/kernel/net/*/netfilter/:
/lib/modules/2.6.38/kernel/net/bridge/netfilter/:
ebt_802_3.ko.gz       ebt_arp.ko.gz      ebt_log.ko.gz       ebt_snat.ko.gz
ebtable_broute.ko.gz  ebt_arpreply.ko.gz  ebt_mark.ko.gz      ebt_stp.ko.gz
ebtable_filter.ko.gz  ebt_dnat.ko.gz      ebt_mark_m.ko.gz    ebt_ulog.ko.gz
ebtable_nat.ko.gz     ebt_ip6.ko.gz      ebt_nflog.ko.gz     ebt_vlan.ko.gz
ebtables.ko.gz          ebt_ip.ko.gz      ebt_pkttype.ko.gz
ebt_among.ko.gz       ebt_limit.ko.gz      ebt_redirect.ko.gz
/lib/modules/2.6.38/kernel/net/ipv4/netfilter/:
arptable_filter.ko.gz  ipt_ECN.ko.gz        nf_nat_h323.ko.gz
arp_tables.ko.gz       ipt_LOG.ko.gz        nf_nat_irc.ko.gz
arpt_mangle.ko.gz      ipt_MASQUERADE.ko.gz    nf_nat.ko.gz
iptable_filter.ko.gz   ipt_NETMAP.ko.gz        nf_nat_pptp.ko.gz
iptable_mangle.ko.gz   ipt_REDIRECT.ko.gz    nf_nat_proto_dccp.ko.gz
iptable_nat.ko.gz      ipt_REJECT.ko.gz        nf_nat_proto_gre.ko.gz
iptable_raw.ko.gz      ipt_ULOG.ko.gz        nf_nat_proto_sctp.ko.gz
ip_tables.ko.gz        nf_conntrack_ipv4.ko.gz    nf_nat_proto_udplite.ko.gz
ipt_addrtype.ko.gz     nf_defrag_ipv4.ko.gz    nf_nat_sip.ko.gz
ipt_ah.ko.gz           nf_nat_amanda.ko.gz    nf_nat_snmp_basic.ko.gz
ipt_ecn.ko.gz           nf_nat_ftp.ko.gz        nf_nat_tftp.ko.gz
/lib/modules/2.6.38/kernel/net/ipv6/netfilter/:
ip6table_filter.ko.gz  ip6t_eui64.ko.gz       ip6t_mh.ko.gz
ip6table_mangle.ko.gz  ip6t_frag.ko.gz          ip6t_REJECT.ko.gz
ip6table_raw.ko.gz     ip6t_hbh.ko.gz          ip6t_rt.ko.gz
ip6_tables.ko.gz       ip6t_ipv6header.ko.gz  nf_conntrack_ipv6.ko.gz
ip6t_ah.ko.gz           ip6t_LOG.ko.gz          nf_defrag_ipv6.ko.gz